Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and PF940C 80% Pistol Frame (Black Only)

For builders who demand precision and consistency across platforms, the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and PF940C 80% Pistol Frame (Black Only) delivers a matched set of unfinished receivers engineered for DIY firearm construction. This bundle pairs Polymer80’s flagship AR15 lower with a compact, reliable 9mm pistol frame, both in a uniform black finish. Each component is manufactured to exacting tolerances, requiring standard machining and finishing steps to complete. As an 80% product, neither frame is a firearm under federal regulation, and no serial number is provided, making this kit suitable for personal manufacture where permitted by law.

Overview

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and PF940C 80% Pistol Frame (Black Only) represents a comprehensive foundation for two distinct builds. The RL556V3 lower is compatible with mil-spec AR15 upper receivers and parts kits, featuring an integrated trigger guard, flared magwell, and reinforced rear takedown pin boss. The PF940C frame is designed for Glock 19 Gen3-compatible slides and internals, offering a reduced grip angle and textured side panels. Both components are crafted from impact-modified polymer with stainless steel insert rails and hardened steel pin locations. This kit is intended for experienced builders who possess the tools and knowledge to complete 80% receivers safely and legally.

Features & Specs

Every aspect of the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and PF940C 80% Pistol Frame (Black Only) is built around repeatability and structural integrity. The RL556V3 lower incorporates a 45-degree safety selector pocket, extended bolt catch recess, and oversized magazine release button clearance. The PF940C frame uses a patented rear rail system with four stainless steel guide rods for consistent slide travel. Below is a detailed breakdown of specifications and engineering details.

• RL556V3 Lower: Mil-spec buffer tube thread pattern (1.250-18 UNEF), standard trigger pocket dimensions (0.310-inch wide), accepts all drop-in AR15 trigger groups; flared magwell opening measures 0.850 x 1.250 inches; reinforced front pivot pin boss with 0.154-inch diameter hole; includes polymer takedown pin detent spring and buffer retainer.
• PF940C Frame: Accepts Glock 19 Gen3 slide, barrel, and lower parts kit; integrated locking block with hardened steel insert; full-length polymer dust cover; textured grip panels with 25-degree angle; includes front and rear rail modules with stainless steel rails; trigger guard undercut for high-grip shooting.
• Material & Finish: High-impact Nylon 6/6 polymer with glass fiber reinforcement; black molded-in color throughout; no external coating or paint; all metal inserts (rails, pin locations, locking block) are heat-treated steel with black oxide finish; weight: RL556V3 lower 9.2 ounces, PF940C frame 8.7 ounces.

Who It’s For

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and PF940C 80% Pistol Frame (Black Only) is designed for the intermediate to advanced firearm builder who values modularity and platform consistency. This kit is appropriate for individuals who already possess a functional understanding of AR15 and Glock-style pistol assembly, including experience with drilling, milling, and finishing 80% receivers. It is not recommended for first-time builders or those without access to proper jigs and tooling. The matched set is ideal for those who wish to construct two complementary firearms—a full-size rifle and a compact handgun—sharing similar ergonomic DNA and manufacturing quality. Compliance with all federal, state, and local laws regarding 80% receivers and personally manufactured firearms is the sole responsibility of the purchaser.

Shipping & FFL

Because the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and PF940C 80% Pistol Frame (Black Only) is classified as an unfinished, non-serialized receiver set, it is not considered a firearm by the ATF and does not require transfer through a Federal Firearms License (FFL) dealer. This item ships directly to your doorstep via common carrier with adult signature required. No background check is required at the time of purchase. However, it is your responsibility to verify that personal manufacture of firearms is permissible in your state, county, and municipality. Some jurisdictions—including California, New York, New Jersey, Connecticut, Hawaii, Maryland, Washington D.C., and others—impose restrictions on 80% receivers or require serialization upon completion. By purchasing this product, you confirm that you are legally eligible to possess firearms and that you will comply with all applicable laws. Polymer80 components are not returnable or refundable once shipped due to the nature of unfinished goods. All sales are final.